Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1001
CALL
TeraWulf
WULF
$9.94B
| $8.17M | 0.01% |
2,993,500
-1,183,600
| -28% | -$5.27M |
|
1002
Target
TGT
$61.1B
| $8.15M | 0.01% |
78,101
+34,823
| +80% | +$4.35M |
|
1003
PUT
International Paper
IP
$20.1B
| $8.15M | 0.01% |
152,700
-17,900
| -10% | -$979K |
|
1004
PUT
Whirlpool
WHR
$2.31B
| $8.14M | 0.01% |
90,300
+3,600
| +4% | +$382K |
|
1005
PUT
MPLX
MPLX
$58.4B
| $8.13M | 0.01% |
152,000
+27,700
| +22% | +$1.45M |
|
1006
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $8.12M | 0.01% |
375,500
+205,400
| +121% | +$19.1M |
|
1007
PUT
Booz Allen Hamilton
BAH
$7.9B
| $8.12M | 0.01% |
77,600
+50,500
| +186% | +$6.09M |
|
1008
PUT
Floor & Decor
FND
$5.73B
| $8.1M | 0.01% |
100,700
+50,300
| +100% | +$4.75M |
|
|
P
1009
CALL
Everpure Inc
P
$25B
| $8.1M | 0.01% |
182,900
-116,400
| -39% | -$7.02M |
|
1010
PUT
Ares Management
ARES
$27.4B
| $8.09M | 0.01% |
55,200
+55,100
| +55,100% | +$9.52M |
|
1011
CALL
Papa John's
PZZA
$999M
| $8.09M | 0.01% |
197,000
+118,300
| +150% | +$5.06M |
|
1012
CALL
BILL Holdings
BILL
$4.11B
| $8.07M | 0.01% |
175,900
+18,000
| +11% | +$1.21M |
|
1013
CALL
KB Home
KBH
$3.41B
| $8.07M | 0.01% |
138,800
+11,500
| +9% | +$732K |
|
1014
PUT
Zoetis
ZTS
$31.3B
| $8.03M | 0.01% |
48,800
+15,500
| +47% | +$2.58M |
|
1015
CALL
KLA
KLAC
$286B
| $8.02M | 0.01% |
118,000
-186,000
| -61% | -$13.4M |
|
1016
CALL
Doximity
DOCS
$3.68B
| $8.01M | 0.01% |
138,000
-6,700
| -5% | -$423K |
|
1017
PUT
TG Therapeutics
TGTX
$8.5B
| $8M | 0.01% |
202,900
-129,100
| -39% | -$4.34M |
|
1018
CALL
Vanguard Dividend Appreciation ETF
VIG
$110B
| $7.95M | 0.01% |
41,000
-3,100
| -7% | -$616K |
|
1019
CALL
Phillips 66
PSX
$83B
| $7.93M | 0.01% |
64,200
-76,600
| -54% | -$9.44M |
|
1020
PUT
TransDigm Group
TDG
$67.9B
| $7.88M | 0.01% |
5,700
-8,600
| -60% | -$11.5M |
|
|
1021
PUT
BILL Holdings
BILL
$4.11B
| $7.88M | 0.01% |
171,800
+30,700
| +22% | +$2.06M |
|
1022
PUT
Fastenal
FAST
$53B
| $7.88M | 0.01% |
203,200
+63,600
| +46% | +$2.38M |
|
1023
CALL
Arbor Realty Trust
ABR
$966M
| $7.88M | 0.01% |
670,300
+20,100
| +3% | +$260K |
|
1024
PUT
Cenovus Energy
CVE
$55.4B
| $7.87M | 0.01% |
565,800
-32,000
| -5% | -$461K |
|
1025
Iris Energy
IREN
$14.5B
| $7.84M | 0.01% |
1,287,755
+251,955
| +24% | +$2.45M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.